Fear may be able to spread from person to person—just like a virus.
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New York Magazine: Is There An Antidote for Emotional Contagion?
http://nymag.com/scienceofus/2015/04/...

PLoS ONE: Chemosensory Cues to Conspecific Emotional Stress Activate Amygdala in Humans
http://journals.plos.org/plosone/arti...

Journal of Marketing Research: What Makes Online Content Viral?
http://journals.ama.org/doi/abs/10.15...

Scientific American: The Secret to Online Success: What Makes Content Go Viral
https://www.scientificamerican.com/ar...

Nautilus: Nothing Snowballs Online Like Fear
http://nautil.us/issue/33/attraction/...

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